Pressure dependence of the magnetoresistance oscillations spectrum of beta''-(BEDT-TTF)4(NH4)[Fe(C2O4)3].DMF

Alain Audouard (1) , Vladimir N. Laukhin (2, 3) , Jérome Béard (1) , David Vignolles (1) , Marc Nardone (1) , Enric Canadell (2) , Tatyana G. Prokhorova (4) , Eduard Yagubskii (4)

1 LNCMP - Laboratoire National des Champs Magnétiques Pulsés
2 ICMAB - Institut de Ciència de Materials de Barcelona
3 ICREA - Institució Catalana de Recerca i Estudis Avançats = Catalan Institution for Research and Advanced Studies
4 IPCP - Institute of Problems of Chemical Physics

The pressure dependence of the interlayer magnetoresistance of the quasi-two dimensional organic metal beta''-(BEDT-TTF)4(NH4)[Fe(C2O4)3].DMF has been investigated up to 1 GPa in pulsed magnetic fields up to 55 T. The Shubnikov-de Haas oscillations spectra can be interpreted on the basis of three compensated orbits in all the pressure range studied, suggesting that the Fermi surface topology remains qualitatively the same as the applied pressure varies. In addition, all the observed frequencies, normalized to their value at ambient pressure, exhibit the same sizeable pressure dependence. Despite this behavior, which is at variance with that of numerous charge transfer salts based on the BEDT-TTF molecule, non-monotonous pressure-induced variations of parameters such as the scattering rate linked to the various detected orbits are observed.

Domaines: Electrons fortement corrélés [cond-mat.str-el]

Alain Audouard, Vladimir N. Laukhin, Jérome Béard, David Vignolles, Marc Nardone, et al.. Pressure dependence of the magnetoresistance oscillations spectrum of beta''-(BEDT-TTF)4(NH4)[Fe(C2O4)3].DMF. 2006. ⟨hal-00112312v2⟩